ulna

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arm

arm, upper limb in humans. Three long bones form the framework of the arm: the humerus of the upper arm, and the radius (outer bone) and ulna (inner bone) of the forearm. The radius and ulna run parallel but meet at their ends in such a manner that the radius can rotate around the ulna. This arrangement permits turning the forearm to bring the hand palm up (supination) or palm down (pronation). The radius and ulna hinge with the bones of the hand at the wrist, and with the humerus at the elbow. The biceps brachii, a muscle of the upper arm, bends the arm at the elbow; the triceps brachii straightens the arm. Movement of the arm across the chest and above the head is accomplished by the pectoral muscles of the chest and deltoid muscles of the shoulder, respectively. In an adult the arm is normally five sixths as long as the leg.
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ulna

[′əl·nə]
(anatomy)
The larger of the two bones of the forearm or forelimb in vertebrates; articulates proximally with the humerus and radius and distally with the radius.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ulna

1. the inner and longer of the two bones of the human forearm
2. the corresponding bone in other vertebrates
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Intraosseous lipoma in the ulna and radius of a two-year-old Leonberger.
Ventrodorsal radiographic view of a rose-breasted cockatoo with a moth-eaten pattern of lysis (asterisks) in all bones of the wings and both tibiotarsi, cortical expansion and irregular contour of the left ulna (circle), area of subperiosteal scalloping and lysis (large arrowheads), and irregular periosteal reaction (small arrowhead) of the tarsi.
Left ulna of the rose-breasted cockatoo described in Figure 1 showing thinning of the cortex (arrow) and invasion of the surrounding soft tissues and medulla by well-differentiated adipocytes (asterisks) (hematoxylin and eosin stain; bar = 500 nm).
Estudo experimental da acao do ultra-som na regeneracao ossea de ostectomias parciais em ulna de caes.
maximal compression plating of the ulna: a biomechanical study of indirect reduction technique.
Minimal versus maximal plate fixation techniques of the ulna: the biomechanical effect of number of screws and plate length.
El foramen nutricio en los huesos del brazo y antebrazo, se encuentra ubicado en el humero, inmediatamente distal a la impresion rugosa para la insercion del musculo coracobraquial (Lockhart, 1965; Goss, 1976; Rouviere & Delmas, 1999); en la ulna y radio se ubica proximal a la mitad de su cara anterior, dirigiendose hacia la epifisis proximal (Poirier, 1908; Orts Llorca, 1963; Gardner, 1971).
al., entre otros, han descrito que en el humero, el foramen nutricio se encuentra en su cara antero medial y en la ulna y el radio, en su cara anterior.
The ulna (Ulna) of the Saguinus leucopus is a long bone.
Along the ulna, four surfaces (Facies) are formed: a slightly curved caudal surface, free from attachments and observed once the skin is removed; a lateral surface that forms a groove along its length for the origin of the abductor digit I (Pollicis) longus muscle and the deep extensor muscles of the digits; a medial concave surface at its proximal third and flattened at its two distal thirds; and a cranial surface on the three proximal quarters.
The surgical site of the left ulna was aseptically prepared with topical chlorhexidine solution, and the surgical area was painted with povidone solution.
In all birds, the ulna fractures were stabilized with 4 type-1 ESF pins (size, 0.045 in; Imex Veterinary Inc, Longview, TX, USA).